Nominal width, defined

The dosimetric quantities typically used in CT are the CT dose index (CTDI) and the dose length product (DLP). The CTDI is defined for an axial CT scan (one rotation of the X-ray tube) by dividing the integral of the absorbed dose along the z axis by the nominal beam width. As shown in Fig. 4.2, this value is equivalent to the dose within the nominal width of the slice assuming that the absorbed dose has a rectangular profile with a constant dose inside the nominal width and zero dose outside. 

The linear dispersion. This is the spectral width in nm transmitted through the exit slit of the monochromator. It is given in units of nm/mm. For example 5 nm/mm would mean that the nominal bandwidth of the monochromatic light is 5 nm if the slit width is 1 mm. This defines the purity of the monochromatic light. 

The spectral bandwidth of a spectrophotometer is measured by use of a mercury-vapor lamp, which shows a number of sharp, well-defined emission lines between 250 and 580 nm. The apparent width of an emission band at half-peak height is taken to be the spectral bandwidth of the instrument (see Figure 3-7). The spectral bandwidth may also be calculated from the manufacturer s specifications. Interference filters with spectral bandwidths of 1 to 2nm are available and may be used to check those instruments with a nominal spectral bandwidth of 8 nm or more. 

Fio. 9.3.4 Excitation with a surface coil of 9 mm diameter in a Bo gradient of the order of lOT/m by the NMR-MOUSE (a) Series train of CPMG echoes from a carbon-black filled SBR section of an intact car tyre with a steel belt. A fit of the echo envelope with an exponential decay function yields a transverse relaxation time Ti [Eidl]. (b) Variation of the pulse duration in an a — te/l — Ta — ts/ i- pulse sequence for different rf frequencies. For each frequency maxima and minima are observed which define the nominal 90° and 180° pulse widths. With decreasing rf frequency the distance of the sensitive volume from the rf coil increases. A frequency of 17.5 MHz correspond to depths of 0-0.5 mm, 16MHz to 0.5-1.0mm, and 16.5 MHz to 1.0-1.5 mm into the sample [Gut3], (c) Hahn- and solid-echo envelopes for a sample of carbon-black filled cross-linked SBR. The Hahn-echo decay is faster because of residual dipolar couplings which are partially refocused by the solid-echo [Gut3]. (d) Multi-echo excitation. 

Standard roller chains are defined as pitch proportional, which makes them different from othCT types of chains with rollers. The ASME standards nominal dimensions for these chains are approximately proportional to the chain pitch. The pitch of a roller chain is the distance betweai the centers of adjacent joint members. The three most important roller chain dimensions are pitch, roller diameter, and inside chain width, as indicated in Figure 2-5. These dimensions detramine the fit between the chain and the sprockets. 

As described in Chapter 7, there are two very important performance specifications of a quadrupole—resolution and abundance sensitivity. Although they both define the ability of a quadrupole to separate an analyte peak from a spectral interference, they are measured differently. Resolution reflects the shape of the top of the peak and is normally defined as the width of a peak at 10% of its height. Most instruments on the market have similar resolution specifications of 0.3-3.0 amu and typically use a nominal setting of 0.7-1.0 amu for all masses in a multielement run. For this reason, it is unlikely you will see any measurable difference when you make your comparison. 

The square image size used to define the requirement is the defined monitor size Wmonitorihor and the width of one line at position 1 is (w chart/9). Thus, the nominal spatial frequency at position 1 in this defined monitor size is calculated by the following Eq. (10). 

Alternatively, ASCE/SEI 41 (2007) provides recommendations for the shear strength and joint shear stress-strain relationship of unreinforced joints for seismic rehabilitation purposes based on the pre-standard developed in FEMA 273 (FEMA 1997) and FEMA 356 (FEMA 2000). According to ASCE 41, nominal joint shear strength (F ) is defined according to Eq. 12 it is a function of a coefficient y , joint width (bj), column depth (hr), and concrete tensile strength... 

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